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Vulnerability record · CVE-2025-38562 · published 19 August 2025

CVE-2025-38562: Linux kernel null pointer dereference vulnerability

Linux · Linux Kernel

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix null pointer dereference error in generate_encryptionkey If client send two session setups with krb5 authenticate to ksmbd, null pointer dereference error in generate_encryptionkey could happen. sess->Preauth_HashValue is set to NULL if session is valid. So this patch skip generate encryption key if session is valid.

5.5 CVSS 3.1 Medium EPSS 8.3% · top 5.3% CWE-476 · NULL pointer dereference
5.5CVSS 3.1 base score
8.3%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
9References
17 Jun 2026Last modified by NVD

Description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix null pointer dereference error in generate_encryptionkey If client send two session setups with krb5 authenticate to ksmbd, null pointer dereference error in generate_encryptionkey could happen. sess->Preauth_HashValue is set to NULL if session is valid. So this patch skip generate encryption key if session is valid.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/015ef163d65496ae3ba6192c96140a22743f0353 Patch
https://git.kernel.org/stable/c/2a30ed6428ce83afedca1a6c5c5c4247bcf12d0e Patch
https://git.kernel.org/stable/c/922f85e6e88fdea723a26854c3a6dcb4beb8d0b9
https://git.kernel.org/stable/c/96a82e19434a2522525baab59c33332658bc7653 Patch
https://git.kernel.org/stable/c/9b493ab6f35178afd8d619800df9071992f715de Patch
https://git.kernel.org/stable/c/9c2dbbc959e1fcc6f603a1a843e9cf743ba383bb Patch
https://git.kernel.org/stable/c/d79c8bebaa622ee223128be7c66d8aaeeb634a57 Patch
https://www.zerodayinitiative.com/advisories/ZDI-25-917/ Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html Mailing ListThird Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2025-38562), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.